Diagram Diagosis

The antenna of mobile phone jammer should be perpendicular to the ground
Introduced Vodafone (LSE: VOD NYSE: VOD) (Vodafone) is a multinational mobile phone operators. Newbury (Newbury), headquartered in Berkshire County, England and Dusseldorf, Germany. Is currently one of the worlds largest mobile telecommunications network company, have investments in 27 countries around the world. Do co-operate with the local mobile phone operators in 14 countries, the mobile phone network of associates. As of December 31, 2004, Vodafone has about 151.8 million users in the world. Vodafone Vodafone Group as the name listed on the London Stock Exchange (code VOD.L) and the NYSE (symbol VOD). mobile phone jammer can be installed in the ceiling in the hall.
AT & T will be the "information superhighway" the plan participants. Will achieve the ideal of mankind - the establishment of a global information service system, so that people anywhere convenient to contact, the sharing of information resources to meet the advent of the information society. Germany Vodafone vodafone Vodafone (in vodafone KK) is the worlds largest mobile communications operator, and its network covering 26 countries, and to provide network services in 31 countries and their partners, over 179 million users worldwide. Vodafone has the worlds most comprehensive enterprise information management systems and customer service systems, service delivery, increase customer has a strong advantage in creating value. Here will show the bulk shielding of mobile phone jammer in a building.
In addition to Spains four stock (Madrid, Barcelona, Bilbao and Valencia), Spain, the telephone companys stock is still in London, Paris, Frankfurt, Tokyo, New York, Sao Paulo, Limas stock market and London the SEAQ International stock trading system to trade. In order to remain invincible in the fierce competition in international telecommunications market, the telephone company in Spain organized a series of international business lines, operated by an independent company. Such a flexible management style is conducive to take measures according to their characteristics, can also enhance the financial strength through joint ventures. Not long ago, the Spanish telephone company into the Internet field, by the same company responsible for production and sales operations. Shielding effect of mobile phone jammer is dependent on room size.
Meanwhile, Cisco Systems, Inc. is building the backbone of the Internet, more than 80 percent of the Internet backbone routers is Cisco Systems, the companys products. Texas Instruments (TI) - Texas Instruments Incorporated is a global semiconductor company, is the world leader in digital signal processing and analog technologies and suppliers, the semiconductor engines of the Internet age. The worlds first integrated circuit (IC) was invented by TI engineer Jack Kilby. The company is headquartered in Dallas, Texas, its business, including semiconductor, industrial, electronic materials, educational products. Companies in over 25 countries worldwide and has manufacturing or sales organization. In this method, there is no need to install mobile phone jammer on the outer wall of every floor.

Cell Phone Jammers has no radiation towards the human body.
Although almost all manufacturers have in recent years tend to use lithium-ion battery, but the worlds major mobile phone manufacturers the choice of battery or have their own characteristics and habits, such as once in the same historical period: Nokia: The Ni- MH (nickel-metal hydride) battery, LiB (liquid lithium-ion) batteries, not the use of LiP (polymer lithium-ion) batteries. Ericsson: The Ni-MH battery, LiB battery, LiP batteries. Motorola: The Ni-MH battery, LiB battery, did not use LiP batteries. Not difficult to find, from the earliest use of mobile phones LiP polymer lithium-ion batteries on this matter, Ericsson reflect the true nature of their cell phone technology pioneer. According to the information I find that, at present polymer lithium-ion battery factory in Japan SONY, Panasonic, GS, several companies, produced in 2000 reached 21 million, of which 50% of Ericsson mobile phone support. 
This environment is very noisy radio environments, it is even more obvious advantages. Another advantage of Bluetooth technology is that it applies globally consistent set of frequencies, which eliminates the "border" barriers, while in the field of cellular mobile phones, this obstacle has been plagued users for many years. In addition, ISM band radio system for all the bands are open, so use one of these bands will encounter unpredictable sources of interference. For example, some appliances, cordless phones, car room door openers, microwave ovens, etc., are likely to be interference. The inspection report of Cell Phone Jammers needs the signature of the director of Cell Phone Jammers workshop.
To this end, the Bluetooth technology, especially designed to quickly identify and frequency hopping scheme to ensure that the link stability. Band frequency hopping is to be divided into a number of hopping channels (hop channel), in a single connection, the radio transceiver according to a certain code sequence constantly jump from one channel to another channel, only the sender and receiver to communicate is based on the law , and other interference can not be carried out by the same laws of interference; hopping the instantaneous bandwidth is very narrow, but through spread spectrum technology make this expansion into narrowband or broadband multiply, so that interference effects may become very small. Work with other systems compared to the same frequency band, Bluetooth frequency hopping faster, shorter packets, which makes Bluetooth technology are more stable than other systems. Chipset mainly refers to the Bluetooth headset Bluetooth chips used in the design of the composition. Bluetooth chip on the market today many manufacturers. Major telecommunications manufacturers have designed in accordance with Bluetooth standards have different chipsets. The factory inspection and acceptance personnel should sign the report of Cell Phone Jammers if Cell Phone Jammers is qualified.

The “Link” intercom has been designed in such a way that you can buy parts for it ‘off the shelf’ at just about any decent electronics retail chain. It uses old pulse dial handsets and replaces the AC bell set with a 9 volt DC buzzer. The whole circuit runs from a 12 volt regulated DC supply and is suitable for short term battery operation (eg: ‘Gel Cell’). It is suitable for radio field days and sporting events (providing you can scrounge enough 4 wire cable) and may find a place in pre-schools, old folk’s homes, boy scout/girl guide halls, churches, kids’ tree houses/fortresses, or maybe even more serious uses such as small offices, factories, workshops and many other applications.











The Link telephone intercom is designed around two ICs. The first, IC1, is an NE 556 dual timer chip, which is wired up to provide dial tone, ring tone (busy tone too, which will be explained along with a few add-ons to be mentioned later on) and ring pulses for the ringer circuit attached to each line circuit. The other chip, IC 2, is a CD 4017B decade counter, which is wired to count each train of dial pulses as they are received and buffered by the two opto-couplers, OC1 and OC 2 and their associated R/C networks.

Line Circuits
Each phone handset is connected by a four wire circuit from the ‘black box’. Two wires (normally tagged ‘white’ and ‘blue’ here in Oz) are for speech and dialing functions, whereas the other two (tagged locally as ‘red’ and ‘black’) are for the ring pulses supplied by the ringer circuit to each DC buzzer inside the handsets. When a phone (eg: #1 for our discussion) is picked up in its ‘off hook’ condition, a DC loop is formed by the following components: DC circuitry inside the phone, the 1K winding of transformer TX, and back to 0V- earth. Taken from the +12 volts terminal, through the Leds inside OC1 and OC2 and back to the phone handset.



Making A Call
Dial tone is provided to the calling party’s phone when the Link is in its ‘reset’ condition (no calls in progress) via capacitor C3 and the 8 ohm winding (8R) of TX to 0v- earth. This and the other service tones are generated by IC1a, while ring pulses are generated by IC1b. When a calling party’s phone is ‘off hook’, the leds force the photo transistors to switch on hard, pulling pins 13 and 14 of IC2 to 0 volts ground. When the dial inside the phone handset is pulled back and released, the collector lead of OC2’s transistor is held low at 0 volts by the slow release charging of C5. Pin 13 of IC2 is a CE (chip enable) input, and needs to stay at a logic low (near 0 volts) to enable pin 14 to count the dial pulses. So while ‘impulsing’ occurs, pin 13 stays low, and pin 14 alternates between logic high and low as the led emulates each dial pulse train, until the last pulse in the train is received.

Dialing Into The Register
When caller number #1 dials phone number # 4, those four pulses appear across the leds inside OC1 and OC2. The decade counter, acting as a Register (a storage device used in communications equipment for storing dialed digits) counts these pulses, turning its output pins on and off inn unison, with the last dial pulse causing the counter to rest on the last output pin that is turned on. The complete sequence for a maximum of ten pulses in the one pulse train, is (pin 3 is always at logic high at ‘reset’) 2,4,7,10, and then 1,5,6,9,11 and then finally pin 3. So when the number ‘4’ is dialed, the counter would step through pins 2,4,7, and then land on pin 10, which is connected to phone #4’s ringer circuit via Q4’s base lead.



The Ringer Circuit
Each line circuit consists of the individual phone handset, the DC buzzer mounted inside it, the common connections to TX and the cathode of OC2’s led, as well as transistors Q1 to Q4 and common driver transistor Q5. With pin 3 of IC2 at logic high on ‘reset’, diode D3 enables IC2a to provide a Dial Tone from pin 5. When a number is dialed, pin 3 of IC2 goes low on the first dial pulse, removing the logic high via D4 from pins 12 and 8 of IC1b, thus enabling it to charge up C3, and produce ring pulses to IC1a via diode D5, (from pin 9 to pin 4). After about 2 seconds, ring pulses commence, and the modulated dial tone (which then by default becomes an interrupted Ring Tone to the caller) is produced at pin 5 of IC1a, indicating the progress of the call.

True Ring Trip
When the called party answers the call, transistor QX with trimpot R6, (adjusted to detect both phones being ‘off-hook’,) triggers the led and phototransistor inside OC3. This halts the ring pulses and ring tone supplied by IC1a and IC1b for the duration of that call, by supplying a logic high potential to pins 12 and 8 of IC1b via D6. When the call is over, and both parties have hung up their phone handsets (eg: back to the ‘on-hook’ status,) the DC loop formed by the handsets, TX and OC1/OC2 is broken. Pin 13 of IC2 returns to its reset potential of logic high, and extends this high to pin 15 (Reset) of the 4017 decade counter chip, which disables the output selected during the dialing operation, and enables pin 3 to high, thus restoring Dial Tone to the next caller via pin 4 of IC1a.


Resetting The Link
Thus the Link is fully reset and ready for another call. As you can see, it may seem a little complicated to follow the progression through a call, particularly if you haven’t been involved with phones and logic chips much before. At the end of the day, you have some simple counting, pulsing and interfacing circuitry, which will perform all the necessary tasks of a basic intercom, and all at a reasonable cost. I used some formatted matrix board for the p.c.b and IC sockets for all ICs and OC/OC2. I also found that a heat sink fin for the 7812 regulator chip was unnecessary. A box could be used for housing the Link circuitry, and some kind of screw terminal block or ID block (like a small 10 pair KRONE junction box) could be used to terminate the wiring at the box to make it look more professional. Remember these two things. If you leave a phone ‘off-hook’ you will lock up the Link and if you pick up a phone when someone else is dialing, wrong numbers will result. Apart from that, have fun! Austin Hellier 08-Oct-2003

Parts
R1 10k
R2 150k
R3 4k7
R4 47k
R5 2k2
R6 4k7 trimpot
R7 390R
R8 10k
R9 100k
R10 100k
R11 22k
R12-R15 2k2
R16 4k7
R17 4k7
C1 0.22uF
C2 47uF
C3 1uF
C4 2,200uF (power filter cap – not shown, but wired across +12volts & 0v- ground points
Q1-Q5 BC547 n.p.n low gain
Q6 BC 549C high gain with a beta of at least 250+
D1-D7 1N4148 or 1N914 small signal diodes
IC1 NE 556 dual timer chip
IC2 CD 4017B decade counter chip
OC1-OC3 4N25 or 4N28 opto couplers
Tx 1k/8R transformer, with 1k centre tapped
B1-B4 9 volt DC buzzers mounted inside phone handsets
Miscellaneous – wire, cable, matrix or prototyping board, solder, case, 15 volt DC 200ma plug pack
power supply, phone sockets, zip ties, 7812 regulator and filter caps etc.

Anyone who has designed circuits the utilization of the 555 timer chip will, at some time have wished that it may be programmed for longer timing periods. Timing periods better than a few minutes are difficult to reach as a result of component leakage presents in huge timing capacitors turn into vital. There is alternatively no motive to opt for a only digital answer simply but. The circuit proven here uses a 555 timer in the design but nonetheless succeed ins a timing interval of as a lot as an hour! The trick here is to feed the timing capacitor now not with a relentless voltage however with a pulsed dc voltage. The pulses are derived from the un smoothed low voltage output of the ability provide bridge rectifier.The power supply output is just now not referenced to earth possible and the pulsing full wave rectified sign is fed to the bottom of T1 by way of resistor R1. A 100-Hz sq. wave signal is produced on the collector of T1 as the transistor switches.

The sure 1 of 2 of this waveform charges up the timing capacitor C1 via D2 and P1. Diode D2 forestalls the charge on C1 from discharging thru T1 when the sq. wave signal goes low. Push-button S1 is used to start out the timing length. This methodology of charging uses reasonably low component values for P1 (2.2 MΩ) and C1 (100 to 200 µF) but reachs timing durations of up to an hour which is for much longer than a typical 555 circuit configuration.